117 lines
2.4 KiB
Go
117 lines
2.4 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cgroups
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import (
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"fmt"
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"os"
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v1 "github.com/containerd/cgroups/stats/v1"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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// Name is a typed name for a cgroup subsystem
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type Name string
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const (
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Devices Name = "devices"
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Hugetlb Name = "hugetlb"
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Freezer Name = "freezer"
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Pids Name = "pids"
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NetCLS Name = "net_cls"
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NetPrio Name = "net_prio"
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PerfEvent Name = "perf_event"
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Cpuset Name = "cpuset"
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Cpu Name = "cpu"
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Cpuacct Name = "cpuacct"
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Memory Name = "memory"
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Blkio Name = "blkio"
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Rdma Name = "rdma"
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)
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// Subsystems returns a complete list of the default cgroups
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// available on most linux systems
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func Subsystems() []Name {
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n := []Name{
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Freezer,
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Pids,
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NetCLS,
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NetPrio,
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PerfEvent,
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Cpuset,
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Cpu,
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Cpuacct,
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Memory,
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Blkio,
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Rdma,
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}
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if !RunningInUserNS() {
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n = append(n, Devices)
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}
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if _, err := os.Stat("/sys/kernel/mm/hugepages"); err == nil {
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n = append(n, Hugetlb)
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}
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return n
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}
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type Subsystem interface {
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Name() Name
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}
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type pather interface {
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Subsystem
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Path(path string) string
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}
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type creator interface {
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Subsystem
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Create(path string, resources *specs.LinuxResources) error
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}
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type deleter interface {
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Subsystem
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Delete(path string) error
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}
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type stater interface {
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Subsystem
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Stat(path string, stats *v1.Metrics) error
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}
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type updater interface {
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Subsystem
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Update(path string, resources *specs.LinuxResources) error
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}
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// SingleSubsystem returns a single cgroup subsystem within the base Hierarchy
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func SingleSubsystem(baseHierarchy Hierarchy, subsystem Name) Hierarchy {
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return func() ([]Subsystem, error) {
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subsystems, err := baseHierarchy()
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if err != nil {
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return nil, err
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}
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for _, s := range subsystems {
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if s.Name() == subsystem {
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return []Subsystem{
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s,
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}, nil
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}
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}
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return nil, fmt.Errorf("unable to find subsystem %s", subsystem)
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}
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}
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